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Old 02-28-2014, 01:13 PM   #1
stayne OP
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83 XR350 Questions

Recently picked up an 83 XR350 and have pulled the engine to replace the rings, clean the carbs, etc.

Question: are all 4 valves supposed to be seated perfectly flush? I can see light through a couple of gaps. This is a learning experience for me so any help is appreciated it. If not, I'm wondering if I need new valves, valve guides, springs, or all three.

I'm really taking my time with this one. Just finished refreshing my 79 XL500S and it was fairly easy but this thing is nuts. Got it for $220, was a yard decoration for no telling how many years but surprisingly it's in very good shape. Piston looks good, sleeve, gears, etc.

I have several pics if needed but I figure the question is basic enough. Thanks guys/gals.

PS: If anyone has parts let me know. I need the right side plastic cover for starters. Not much more.
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Old 02-28-2014, 01:17 PM   #2
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You're going to need a valve job at least. Find a machine shop, if you don't mind shipping the parts off for work, there is alot of choices. www.xrsonly.com These guys know these bikes.
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Old 02-28-2014, 02:26 PM   #3
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the better question is.."if" you see light..is the cam in the head still?...if not then you need a val;ve job...if yes..try rotating it
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Old 03-01-2014, 05:14 AM   #4
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The head is off. Sleeve looks good. Valve springs seem good but only one valve is perfectly seated. The other three have small gaps, almost as if they are misaligned. Need pics?
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Old 03-01-2014, 05:19 AM   #5
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Pics would be great.
If all valves are seated (closed) yet you can see light through where they seat, it sounds like they're bent and will need to be replaced.
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Old 03-01-2014, 05:28 AM   #6
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Old 03-01-2014, 05:35 AM   #7
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Those are the exhaust valves that are not seated and it looks like some crud has built up on the seat/valve face. Time for a valve job.

My preferred machinist: http://www.enginedynamics.com/

Tell Mike I sent ya.
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Old 03-01-2014, 05:42 AM   #8
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Old 03-01-2014, 05:45 AM   #9
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Oh yeah, those are bent.
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Old 03-01-2014, 05:46 AM   #10
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No sir not a one. Piston looks great after I got all the gunk off the top.
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Old 03-01-2014, 05:49 AM   #11
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Quote:
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No sir not a one. Piston looks great after I got all the gunk off the top.
Just changed my response when your pic appeared.

Definitely gonna need some new valves. Better look at the guides as well--and of course a valve job.
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Old 03-01-2014, 05:51 AM   #12
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Well i am hellbent on waking it back up. Already ordered gaskets, rings and the timing chain guide (pivot point broke off). Hope it ends up more fun than my 79 XL500. That thing is indestructible.
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Old 03-01-2014, 06:01 AM   #13
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Quote:
Originally Posted by stayne View Post
Well i am hellbent on waking it back up. Already ordered gaskets, rings and the timing chain guide (pivot point broke off). Hope it ends up more fun than my 79 XL500. That thing is indestructible.
I've owned the 250, 500, 600 and 650R XRs but never a 350. The people who have owned them speak highly of them. Some thought it was the perfect size XR back in the day.
You're probably going to have pretty close to the same amount of power as the XL500( but not quite the low RPM grunt) in a much better chassis, suspension and brakes.
Does your bike have the front disc brake? I seem to recall the first year XR350 didn't.
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Old 03-01-2014, 06:37 AM   #14
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The XR350's had front disc's. I had one back in the day. Sold it to buy my XR600.

Those valves may be sticking open because of build up on the stem. Wire wheel the valve face and stem and see if it seats. Slightly lift it off of the seat and spin it to see if the head wobbles. If it does then it's bent.

The common issue with the XR350 was wear on the small end of the rod. They all seemed to have a bit of a knock after time. Mine did.
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Old 03-01-2014, 07:21 AM   #15
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This one has drum brakes on the front. Promise.
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